From a3d191f8182cdddcf5b32b2b32e7563c174d7f52 Mon Sep 17 00:00:00 2001
From: Jimmy Cai <jimmehcai@gmail.com>
Date: Wed, 23 Dec 2020 17:15:17 +0100
Subject: [PATCH] feat(darkmode): initial support for dark mode toggle

---
 assets/scss/partials/darkmode.scss            | 26 +++++++
 .../partials/highlight/dark.scss}             |  5 --
 .../partials/highlight/light.scss}            |  4 -
 assets/scss/partials/menu.scss                |  3 +-
 assets/scss/style.scss                        |  1 +
 assets/scss/variables.scss                    | 19 ++++-
 assets/ts/darkmode.ts                         | 76 +++++++++++++++++++
 assets/ts/main.ts                             |  3 +
 layouts/_default/baseof.html                  | 22 +++++-
 .../partials/footer/components/highlight.html |  4 -
 layouts/partials/footer/include.html          |  1 -
 layouts/partials/sidebar/left.html            |  6 ++
 12 files changed, 150 insertions(+), 20 deletions(-)
 create mode 100644 assets/scss/partials/darkmode.scss
 rename assets/{css/highlight/dark.css => scss/partials/highlight/dark.scss} (98%)
 rename assets/{css/highlight/light.css => scss/partials/highlight/light.scss} (98%)
 create mode 100644 assets/ts/darkmode.ts
 delete mode 100644 layouts/partials/footer/components/highlight.html

diff --git a/assets/scss/partials/darkmode.scss b/assets/scss/partials/darkmode.scss
new file mode 100644
index 0000000..dc0abd8
--- /dev/null
+++ b/assets/scss/partials/darkmode.scss
@@ -0,0 +1,26 @@
+[data-scheme="dark"] {
+    #dark-mode-toggle {
+        color: var(--accent-color);
+        font-weight: 700;
+
+        .icon-tabler-toggle-left {
+            display: none;
+        }
+
+        .icon-tabler-toggle-right {
+            display: unset;
+        }
+    }
+}
+
+#dark-mode-toggle {
+    margin-top: auto;
+    color: var(--body-text-color);
+    display: flex;
+    align-items: center;
+    cursor: pointer;
+
+    .icon-tabler-toggle-right {
+        display: none;
+    }
+}
diff --git a/assets/css/highlight/dark.css b/assets/scss/partials/highlight/dark.scss
similarity index 98%
rename from assets/css/highlight/dark.css
rename to assets/scss/partials/highlight/dark.scss
index 7f5b872..00e8942 100644
--- a/assets/css/highlight/dark.css
+++ b/assets/scss/partials/highlight/dark.scss
@@ -3,11 +3,6 @@
 *   https://xyproto.github.io/splash/docs/monokai.html
 */
 
-:root {
-    --pre-text-color: #f8f8f2;
-    --pre-background-color: #272822;
-}
-
 /* Background */
 .chroma {
     color: #f8f8f2;
diff --git a/assets/css/highlight/light.css b/assets/scss/partials/highlight/light.scss
similarity index 98%
rename from assets/css/highlight/light.css
rename to assets/scss/partials/highlight/light.scss
index 9c4e0da..7ac7d71 100644
--- a/assets/css/highlight/light.css
+++ b/assets/scss/partials/highlight/light.scss
@@ -2,10 +2,6 @@
 *   Style: monokailight
 *   https://xyproto.github.io/splash/docs/monokailight.html
 */
-:root {
-    --pre-text-color: #272822;
-    --pre-background-color: #fafafa;
-}
 
 /* Background */
 .chroma {
diff --git a/assets/scss/partials/menu.scss b/assets/scss/partials/menu.scss
index 5cefeb3..024b3a6 100644
--- a/assets/scss/partials/menu.scss
+++ b/assets/scss/partials/menu.scss
@@ -129,6 +129,8 @@
     margin-top: var(--sidebar-element-separation);
     margin-bottom: 0;
     overflow-y: auto;
+    flex-grow: 1;
+    font-size: 1.5rem;
 
     @media (min-width: $on-desktop-large) {
         margin-top: 30px;
@@ -192,7 +194,6 @@
             display: inline-flex;
             align-items: center;
             color: var(--body-text-color);
-            font-size: 1.5rem;
 
             @media (max-width: $on-desktop-large) {
                 font-size: 1.4rem;
diff --git a/assets/scss/style.scss b/assets/scss/style.scss
index 2f5aac9..030273a 100644
--- a/assets/scss/style.scss
+++ b/assets/scss/style.scss
@@ -19,6 +19,7 @@
 @import "partials/pagination.scss";
 @import "partials/sidebar.scss";
 @import "partials/base.scss";
+@import "partials/darkmode.scss";
 @import "partials/layout/archives.scss";
 @import "partials/layout/article.scss";
 @import "partials/layout/list.scss";
diff --git a/assets/scss/variables.scss b/assets/scss/variables.scss
index 14d9e07..3a8a1a5 100644
--- a/assets/scss/variables.scss
+++ b/assets/scss/variables.scss
@@ -1,6 +1,18 @@
 $defaultTagBackgrounds: #8ea885, #df7988, #0177b8, #ffb900, #6b69d6;
 $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
 
+[data-scheme="light"] {
+    --pre-text-color: #272822;
+    --pre-background-color: #fafafa;
+    @import "partials/highlight/light.scss";
+}
+
+[data-scheme="dark"] {
+    --pre-text-color: #f8f8f2;
+    --pre-background-color: #272822;
+    @import "partials/highlight/dark.scss";
+}
+
 /*
 *   Global style
 */
@@ -13,7 +25,6 @@ $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
         --main-top-padding: 50px;
     }
 
-
     --body-background: #f5f5fa;
 
     --accent-color: #34495e;
@@ -25,7 +36,7 @@ $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
 
     --section-separation: 40px;
 
-    @media (prefers-color-scheme: dark) {
+    [data-scheme="dark"] {
         --body-background: #303030;
         --accent-color: #ecf0f1;
         --accent-color-darker: #bdc3c7;
@@ -72,7 +83,7 @@ $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
         --small-card-padding: 25px 20px;
     }
 
-    @media (prefers-color-scheme: dark) {
+    [data-scheme="dark"] {
         --card-background: #424242;
         --card-background-selected: rgba(255, 255, 255, 0.16);
         --card-text-color-main: rgba(255, 255, 255, 0.9);
@@ -116,7 +127,7 @@ $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
     --table-border-color: #dadada;
     --tr-even-background-color: #efefee;
 
-    @media (prefers-color-scheme: dark) {
+    [data-scheme="dark"] {
         --code-background-color: #272822;
         --code-text-color: rgba(255, 255, 255, 0.9);
 
diff --git a/assets/ts/darkmode.ts b/assets/ts/darkmode.ts
new file mode 100644
index 0000000..828b8e2
--- /dev/null
+++ b/assets/ts/darkmode.ts
@@ -0,0 +1,76 @@
+type colorScheme = 'light' | 'dark' | 'auto';
+
+class StackDarkMode {
+    private localStorageKey = 'StackColorScheme';
+    private currentScheme: colorScheme;
+    private systemPreferScheme: colorScheme;
+
+    constructor(toggleEl: HTMLElement) {
+        this.bindMatchMedia();
+        this.currentScheme = this.getSavedScheme();
+        this.setBodyClass();
+        this.bindClick(toggleEl);
+    }
+
+    private saveScheme() {
+        localStorage.setItem(this.localStorageKey, this.currentScheme);
+    }
+
+    private bindClick(toggleEl) {
+        toggleEl.addEventListener('click', (e) => {
+            if (this.isDark()) {
+                /// Disable dark mode
+                this.currentScheme = 'light';
+            }
+            else {
+                this.currentScheme = 'dark';
+            }
+
+            this.setBodyClass();
+
+            if (this.currentScheme == this.systemPreferScheme) {
+                /// Set to auto
+                this.currentScheme = 'auto';
+            }
+
+            this.saveScheme();
+        })
+    }
+
+    private isDark() {
+        return (this.currentScheme == 'dark' || this.currentScheme == 'auto' && this.preferDarkMode);
+    }
+
+    private setBodyClass() {
+        if (document.body.style.transition == '')
+            document.body.style.setProperty('transition', 'background-color .3s ease');
+
+        if (this.isDark()) {
+            document.body.dataset.scheme = 'dark';
+        }
+        else {
+            document.body.dataset.scheme = 'light';
+        }
+    }
+
+    private getSavedScheme(): colorScheme {
+        const savedScheme = localStorage.getItem(this.localStorageKey);
+
+        if (savedScheme == 'light' || savedScheme == 'dark' || savedScheme == 'auto') return savedScheme;
+        else return 'auto';
+    }
+
+    private bindMatchMedia() {
+        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (e) => {
+            if (e.matches) {
+                this.systemPreferScheme = 'dark';
+            }
+            else {
+                this.systemPreferScheme = 'light';
+            }
+            this.setBodyClass();
+        });
+    }
+}
+
+export default StackDarkMode;
\ No newline at end of file
diff --git a/assets/ts/main.ts b/assets/ts/main.ts
index 4d07631..e1b9db9 100644
--- a/assets/ts/main.ts
+++ b/assets/ts/main.ts
@@ -9,6 +9,7 @@ import StackGallery from "ts/gallery";
 import { getColor } from 'ts/color';
 import menu from 'ts/menu';
 import createElement from 'ts/createElement';
+import StackDarkMode from 'ts/darkmode';
 
 let Stack = {
     init: () => {
@@ -52,6 +53,8 @@ let Stack = {
 
             observer.observe(articleTile)
         }
+
+        new StackDarkMode(document.getElementById('dark-mode-toggle'));
     }
 }
 
diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index 06a31e5..68f1974 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -5,7 +5,27 @@
         {{- block "head" . -}}{{ end }}
     </head>
     <body class="{{ block `body-class` . }}{{ end }}">
-        <div class="container flex on-phone--column align-items--flex-start {{ if .Site.Params.widgets.enabled }}extended{{ else }}compact{{ end }} {{ block `container-class` . }}{{end}}">
+        <script>
+            (function() {
+                const colorSchemeKey = 'StackColorScheme';
+                const colorSchemeItem = localStorage.getItem(colorSchemeKey);
+                const supportDarkMode = window.matchMedia('(prefers-color-scheme: dark)').matches === true;
+
+                if (colorSchemeItem == 'dark' || !colorSchemeItem && supportDarkMode || colorSchemeItem === 'auto' && supportDarkMode) {
+                    /**
+                     * Enable dark mode if:
+                     * 1. If dark mode is set already (in local storage)
+                     * 2. No color scheme preference is set in localstorage, and user's browser indicates preference for dark mode
+                     * 3. Auto mode & prefere color scheme is dark
+                     */
+                    document.body.dataset.scheme = 'dark';
+                } else {
+                    document.body.dataset.scheme = 'light';
+                }
+            })();
+        </script>
+
+        <div class="container flex on-phone--column {{ if .Site.Params.widgets.enabled }}extended{{ else }}compact{{ end }} {{ block `container-class` . }}{{end}}">
             {{ partial "sidebar/left.html" . }}
             <main class="main full-width">
                 {{- block "main" . }}{{- end }}
diff --git a/layouts/partials/footer/components/highlight.html b/layouts/partials/footer/components/highlight.html
deleted file mode 100644
index 80ec266..0000000
--- a/layouts/partials/footer/components/highlight.html
+++ /dev/null
@@ -1,4 +0,0 @@
-{{- $light := resources.Get "css/highlight/light.css" | minify -}}
-{{- $dark := resources.Get "css/highlight/dark.css" | minify -}}
-<link rel="stylesheet" href="{{ $light.RelPermalink }}" media="(prefers-color-scheme: light)">
-<link rel="stylesheet" href="{{ $dark.RelPermalink }}" media="(prefers-color-scheme: dark)">
\ No newline at end of file
diff --git a/layouts/partials/footer/include.html b/layouts/partials/footer/include.html
index ffa7573..4b50a88 100644
--- a/layouts/partials/footer/include.html
+++ b/layouts/partials/footer/include.html
@@ -1,4 +1,3 @@
 {{ partialCached "footer/components/script.html" . }}
 {{ partialCached "footer/components/custom-font.html" . }}
-{{ partialCached "footer/components/highlight.html" . }}
 {{ partial "footer/custom.html" . }}
\ No newline at end of file
diff --git a/layouts/partials/sidebar/left.html b/layouts/partials/sidebar/left.html
index 9205fa4..dba76f2 100644
--- a/layouts/partials/sidebar/left.html
+++ b/layouts/partials/sidebar/left.html
@@ -45,5 +45,11 @@
             </a>
         </li>
         {{ end }}
+
+        <li id="dark-mode-toggle">
+            {{ partial "helper/icon" "toggle-left" }}
+            {{ partial "helper/icon" "toggle-right" }}
+            <span>Dark Mode</span>
+        </li>
     </ol>
 </aside>